cairo/src/cairo-pdf-surface-private.h

/* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */
/* cairo - a vector graphics library with display and print output
 *
 * Copyright © 2004 Red Hat, Inc
 * Copyright © 2006 Red Hat, Inc
 * Copyright © 2007, 2008 Adrian Johnson
 *
 * This library is free software; you can redistribute it and/or
 * modify it either under the terms of the GNU Lesser General Public
 * License version 2.1 as published by the Free Software Foundation
 * (the "LGPL") or, at your option, under the terms of the Mozilla
 * Public License Version 1.1 (the "MPL"). If you do not alter this
 * notice, a recipient may use your version of this file under either
 * the MPL or the LGPL.
 *
 * You should have received a copy of the LGPL along with this library
 * in the file COPYING-LGPL-2.1; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
 * You should have received a copy of the MPL along with this library
 * in the file COPYING-MPL-1.1
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
 * OF ANY KIND, either express or implied. See the LGPL or the MPL for
 * the specific language governing rights and limitations.
 *
 * The Original Code is the cairo graphics library.
 *
 * The Initial Developer of the Original Code is University of Southern
 * California.
 *
 * Contributor(s):
 *	Kristian Høgsberg <krh@redhat.com>
 *	Carl Worth <cworth@cworth.org>
 *	Adrian Johnson <ajohnson@redneon.com>
 */

#ifndef CAIRO_PDF_SURFACE_PRIVATE_H
#define CAIRO_PDF_SURFACE_PRIVATE_H

#include "cairo-pdf.h"

#include "cairo-surface-private.h"
#include "cairo-surface-clipper-private.h"
#include "cairo-pdf-operators-private.h"
#include "cairo-path-fixed-private.h"
#include "cairo-tag-attributes-private.h"
#include "cairo-tag-stack-private.h"

typedef struct _cairo_pdf_resource {
    unsigned int id;
} cairo_pdf_resource_t;


#define CAIRO_NUM_OPERATORS (CAIRO_OPERATOR_HSL_LUMINOSITY + 1)

typedef struct _cairo_pdf_group_resources {
    cairo_bool_t  operators[CAIRO_NUM_OPERATORS];
    cairo_array_t alphas;
    cairo_array_t smasks;
    cairo_array_t patterns;
    cairo_array_t shadings;
    cairo_array_t xobjects;
    cairo_array_t fonts;
} cairo_pdf_group_resources_t;

typedef struct _cairo_pdf_source_surface_entry {
    cairo_hash_entry_t base;
    unsigned int id;
    unsigned char *unique_id;
    unsigned long unique_id_length;
    cairo_operator_t operator;
    cairo_bool_t interpolate;
    cairo_bool_t stencil_mask;
    cairo_bool_t smask;
    cairo_bool_t need_transp_group;
    cairo_pdf_resource_t surface_res;
    cairo_pdf_resource_t smask_res;

    /* True if surface will be emitted as an Image XObject. */
    cairo_bool_t emit_image;

    /* Extents of the source surface. */
    cairo_bool_t bounded;
    cairo_rectangle_int_t extents;

    /* Union of source extents required for all operations using this source */
    cairo_rectangle_int_t required_extents;
} cairo_pdf_source_surface_entry_t;

typedef struct _cairo_pdf_source_surface {
    cairo_pattern_type_t type;
    cairo_surface_t *surface;
    cairo_pattern_t *raster_pattern;
    cairo_pdf_source_surface_entry_t *hash_entry;
} cairo_pdf_source_surface_t;

typedef struct _cairo_pdf_pattern {
    double width;
    double height;
    cairo_rectangle_int_t extents;
    cairo_pattern_t *pattern;
    cairo_pdf_resource_t pattern_res;
    cairo_pdf_resource_t gstate_res;
    cairo_operator_t operator;
    cairo_bool_t is_shading;

    /* PDF pattern space is the pattern matrix concatenated with the
     * initial space of the parent object. If the parent object is the
     * page, the initial space does not include the Y-axis flipping
     * matrix emitted at the start of the page content stream.  If the
     * parent object is not the page content stream, the initial space
     * will have a flipped Y-axis. The inverted_y_axis flag is true
     * when the initial space of the parent object that is drawing
     * this pattern has a flipped Y-axis.
     */
    cairo_bool_t inverted_y_axis;
} cairo_pdf_pattern_t;

typedef enum _cairo_pdf_operation {
    PDF_PAINT,
    PDF_MASK,
    PDF_FILL,
    PDF_STROKE,
    PDF_SHOW_GLYPHS
} cairo_pdf_operation_t;

typedef struct _cairo_pdf_smask_group {
    double		  width;
    double		  height;
    cairo_rectangle_int_t extents;
    cairo_pdf_resource_t  group_res;
    cairo_pdf_operation_t operation;
    cairo_pattern_t	 *source;
    cairo_pdf_resource_t  source_res;
    cairo_pattern_t	 *mask;
    cairo_path_fixed_t	  path;
    cairo_fill_rule_t	  fill_rule;
    cairo_stroke_style_t  style;
    cairo_matrix_t	  ctm;
    cairo_matrix_t	  ctm_inverse;
    char		 *utf8;
    int                   utf8_len;
    cairo_glyph_t	 *glyphs;
    int			  num_glyphs;
    cairo_text_cluster_t *clusters;
    int                   num_clusters;
    cairo_bool_t          cluster_flags;
    cairo_scaled_font_t	 *scaled_font;
} cairo_pdf_smask_group_t;

typedef struct _cairo_pdf_jbig2_global {
    unsigned char *id;
    unsigned long id_length;
    cairo_pdf_resource_t  res;
    cairo_bool_t emitted;
} cairo_pdf_jbig2_global_t;

/* cairo-pdf-interchange.c types */

struct page_mcid {
    int page;
    int mcid;
};

struct tag_extents {
    cairo_rectangle_int_t extents;
    cairo_bool_t valid;
    cairo_list_t link;
};

typedef struct _cairo_pdf_struct_tree_node {
    char *name;
    cairo_pdf_resource_t res;
    struct _cairo_pdf_struct_tree_node *parent;
    cairo_list_t children;
    cairo_array_t mcid; /* array of struct page_mcid */
    cairo_pdf_resource_t annot_res; /* 0 if no annot */
    struct tag_extents extents;
    cairo_list_t link;
} cairo_pdf_struct_tree_node_t;

typedef struct _cairo_pdf_annotation {
    cairo_pdf_struct_tree_node_t *node; /* node containing the annotation */
    cairo_link_attrs_t link_attrs;
} cairo_pdf_annotation_t;

typedef struct _cairo_pdf_named_dest {
    cairo_hash_entry_t base;
    struct tag_extents extents;
    cairo_dest_attrs_t attrs;
    int page;
} cairo_pdf_named_dest_t;

typedef struct _cairo_pdf_outline_entry {
    char *name;
    cairo_link_attrs_t link_attrs;
    cairo_pdf_outline_flags_t flags;
    cairo_pdf_resource_t res;
    struct _cairo_pdf_outline_entry *parent;
    struct _cairo_pdf_outline_entry *first_child;
    struct _cairo_pdf_outline_entry *last_child;
    struct _cairo_pdf_outline_entry *next;
    struct _cairo_pdf_outline_entry *prev;
    int count;
} cairo_pdf_outline_entry_t;

typedef struct _cairo_pdf_forward_link {
    cairo_pdf_resource_t res;
    char *dest;
    int page;
    cairo_bool_t has_pos;
    cairo_point_double_t pos;
} cairo_pdf_forward_link_t;

struct docinfo {
    char *title;
    char *author;
    char *subject;
    char *keywords;
    char *creator;
    char *create_date;
    char *mod_date;
};

struct metadata {
    char *name;
    char *value;
};

typedef struct _cairo_pdf_interchange {
    cairo_tag_stack_t analysis_tag_stack;
    cairo_tag_stack_t render_tag_stack;
    cairo_array_t push_data; /* records analysis_tag_stack data field for each push */
    int push_data_index;
    cairo_pdf_struct_tree_node_t *struct_root;
    cairo_pdf_struct_tree_node_t *current_node;
    cairo_pdf_struct_tree_node_t *begin_page_node;
    cairo_pdf_struct_tree_node_t *end_page_node;
    cairo_array_t parent_tree; /* parent tree resources */
    cairo_array_t mcid_to_tree; /* mcid to tree node mapping for current page */
    cairo_array_t annots; /* array of pointers to cairo_pdf_annotation_t */
    cairo_pdf_resource_t parent_tree_res;
    cairo_list_t extents_list;
    cairo_hash_table_t *named_dests;
    int num_dests;
    cairo_pdf_named_dest_t **sorted_dests;
    cairo_pdf_resource_t dests_res;
    int annot_page;
    cairo_array_t outline; /* array of pointers to cairo_pdf_outline_entry_t; */
    struct docinfo docinfo;
    cairo_array_t custom_metadata; /* array of struct metadata */

} cairo_pdf_interchange_t;

/* pdf surface data */

typedef struct _cairo_pdf_surface cairo_pdf_surface_t;

struct _cairo_pdf_surface {
    cairo_surface_t base;

    /* Prefer the name "output" here to avoid confusion over the
     * structure within a PDF document known as a "stream". */
    cairo_output_stream_t *output;

    double width;
    double height;
    cairo_rectangle_int_t surface_extents;
    cairo_bool_t surface_bounded;
    cairo_matrix_t cairo_to_pdf;
    cairo_bool_t in_xobject;

    cairo_array_t objects;
    cairo_array_t pages;
    cairo_array_t rgb_linear_functions;
    cairo_array_t alpha_linear_functions;
    cairo_array_t page_patterns;
    cairo_array_t page_surfaces;
    cairo_array_t doc_surfaces;
    cairo_hash_table_t *all_surfaces;
    cairo_array_t smask_groups;
    cairo_array_t knockout_group;
    cairo_array_t jbig2_global;
    cairo_array_t page_heights;

    cairo_scaled_font_subsets_t *font_subsets;
    cairo_array_t fonts;

    cairo_pdf_resource_t next_available_resource;
    cairo_pdf_resource_t pages_resource;
    cairo_pdf_resource_t struct_tree_root;

    cairo_pdf_version_t pdf_version;
    cairo_bool_t compress_streams;

    cairo_pdf_resource_t content;
    cairo_pdf_resource_t content_resources;
    cairo_pdf_group_resources_t resources;
    cairo_bool_t has_fallback_images;
    cairo_bool_t header_emitted;

    struct {
	cairo_bool_t active;
	cairo_pdf_resource_t self;
	cairo_pdf_resource_t length;
	long long start_offset;
	cairo_bool_t compressed;
	cairo_output_stream_t *old_output;
    } pdf_stream;

    struct {
	cairo_bool_t active;
	cairo_output_stream_t *stream;
	cairo_output_stream_t *mem_stream;
	cairo_output_stream_t *old_output;
	cairo_pdf_resource_t   resource;
	cairo_box_double_t     bbox;
	cairo_bool_t is_knockout;
    } group_stream;

    struct {
	cairo_bool_t active;
	cairo_output_stream_t *stream;
	cairo_pdf_resource_t resource;
	cairo_array_t objects;
    } object_stream;

    cairo_surface_clipper_t clipper;

    cairo_pdf_operators_t pdf_operators;
    cairo_paginated_mode_t paginated_mode;
    cairo_bool_t select_pattern_gstate_saved;

    cairo_bool_t force_fallbacks;

    cairo_operator_t current_operator;
    cairo_bool_t current_pattern_is_solid_color;
    cairo_bool_t current_color_is_stroke;
    double current_color_red;
    double current_color_green;
    double current_color_blue;
    double current_color_alpha;

    cairo_pdf_interchange_t interchange;
    int page_parent_tree; /* -1 if not used */
    cairo_array_t page_annots;
    cairo_array_t forward_links;
    cairo_bool_t tagged;
    char *current_page_label;
    cairo_array_t page_labels;
    cairo_pdf_resource_t outlines_dict_res;
    cairo_pdf_resource_t names_dict_res;
    cairo_pdf_resource_t docinfo_res;
    cairo_pdf_resource_t page_labels_res;

    int thumbnail_width;
    int thumbnail_height;
    cairo_image_surface_t *thumbnail_image;

    cairo_surface_t *paginated_surface;
};

cairo_private cairo_pdf_resource_t
_cairo_pdf_surface_new_object (cairo_pdf_surface_t *surface);

cairo_private void
_cairo_pdf_surface_update_object (cairo_pdf_surface_t	*surface,
				  cairo_pdf_resource_t	 resource);

cairo_private cairo_int_status_t
_cairo_utf8_to_pdf_string (const char *utf8, char **str_out);

cairo_private cairo_int_status_t
_cairo_pdf_interchange_init (cairo_pdf_surface_t *surface);

cairo_private void
_cairo_pdf_interchange_fini (cairo_pdf_surface_t *surface);

cairo_private cairo_int_status_t
_cairo_pdf_interchange_begin_page_content (cairo_pdf_surface_t *surface);

cairo_private cairo_int_status_t
_cairo_pdf_interchange_end_page_content (cairo_pdf_surface_t *surface);

cairo_private cairo_int_status_t
_cairo_pdf_interchange_tag_begin (cairo_pdf_surface_t    *surface,
				  const char             *name,
				  const char             *attributes);

cairo_private cairo_int_status_t
_cairo_pdf_surface_object_begin (cairo_pdf_surface_t *surface,
				 cairo_pdf_resource_t resource);

cairo_private void
_cairo_pdf_surface_object_end (cairo_pdf_surface_t *surface);

cairo_private cairo_int_status_t
_cairo_pdf_interchange_tag_end (cairo_pdf_surface_t *surface,
				const char          *name);

cairo_private cairo_int_status_t
_cairo_pdf_interchange_add_operation_extents (cairo_pdf_surface_t         *surface,
					      const cairo_rectangle_int_t *extents);

cairo_private cairo_int_status_t
_cairo_pdf_interchange_write_page_objects (cairo_pdf_surface_t *surface);

cairo_private cairo_int_status_t
_cairo_pdf_interchange_write_document_objects (cairo_pdf_surface_t *surface);

cairo_private cairo_int_status_t
_cairo_pdf_interchange_add_outline (cairo_pdf_surface_t        *surface,
				    int                         parent_id,
				    const char                 *name,
				    const char                 *dest,
				    cairo_pdf_outline_flags_t   flags,
				    int                        *id);

cairo_private cairo_int_status_t
_cairo_pdf_interchange_set_metadata (cairo_pdf_surface_t  *surface,
				     cairo_pdf_metadata_t  metadata,
				     const char           *utf8);

cairo_private cairo_int_status_t
_cairo_pdf_interchange_set_custom_metadata (cairo_pdf_surface_t  *surface,
					const char           *name,
					const char           *value);

#endif /* CAIRO_PDF_SURFACE_PRIVATE_H */